The trick is to organize the elements according to the parts of the rules that are most important and/or fixed. In this case, that means the sequencing of the tasks. This cleanly shows the actors who can perform more than one task--the ones with two checks far from each other--and cascades from left to right. Easy on the eyes and functional, hopefully. The barrier around S is the positive statement that there has to be a day cutoff either before or after so that t and p are separated.

Looking at the two answers. my choice of the diagram above rather than the matrix is probably influenced by PowerScore - I think they try and direct you away from using a matrix because of the time spent in creation, not helped by a ruler not being allowed in the test.

If you can draw it quickly enough, it's a fine approach and might work better for some people. I'm used to using a single line and that works for me.